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/***************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (directui@nokia.com)
**
** This file is part of mcompositor.
**
** If you have questions regarding the use of this file, please contact
** Nokia at directui@nokia.com.
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation
** and appearing in the file LICENSE.LGPL included in the packaging
** of this file.
**
****************************************************************************/
#include <QX11Info>
#include <QKeySequence>
#include <QKeyEvent>
#include <QEvent>
#include <QTimer>
#include <QApplication>
#include <QDesktopWidget>
#include "mcompositewindow.h"
#include "mcompositescene.h"
#include <X11/extensions/Xfixes.h>
#ifdef HAVE_SHAPECONST
#include <X11/extensions/shapeconst.h>
#else
#include <X11/extensions/shape.h>
#endif
#include <X11/extensions/Xcomposite.h>
static int error_handler(Display * , XErrorEvent *error)
{
if (error->resourceid == QX11Info::appRootWindow() && error->error_code == BadAccess) {
qCritical("Another window manager is running.");
::exit(0);
}
if (error->error_code == BadMatch)
qDebug() << "Bad match error " << error->resourceid;
return 0;
}
MCompositeScene::MCompositeScene(QObject *p)
: QGraphicsScene(p)
{
setBackgroundBrush(Qt::NoBrush);
setForegroundBrush(Qt::NoBrush);
setSceneRect(QRect(0, 0,
QApplication::desktop()->width(),
QApplication::desktop()->height()));
installEventFilter(this);
}
void MCompositeScene::prepareRoot()
{
Display *dpy = QX11Info::display();
Window root = QX11Info::appRootWindow();
XSetWindowAttributes sattr;
sattr.event_mask = SubstructureRedirectMask | SubstructureNotifyMask | StructureNotifyMask | PropertyChangeMask;
//XCompositeRedirectSubwindows (dpy, root, CompositeRedirectAutomatic);
XChangeWindowAttributes(dpy, root, CWEventMask, &sattr);
XSelectInput(dpy, root, SubstructureNotifyMask | SubstructureRedirectMask | StructureNotifyMask | PropertyChangeMask);
XSetErrorHandler(error_handler);
}
void MCompositeScene::setupOverlay(Window window, const QRect &geom,
bool restoreInput)
{
Display *dpy = QX11Info::display();
XRectangle rect;
rect.x = geom.x();
rect.y = geom.y();
rect.width = geom.width();
rect.height = geom.height();
XserverRegion region = XFixesCreateRegion(dpy, &rect, 1);
XFixesSetWindowShapeRegion(dpy, window, ShapeBounding, 0, 0, 0);
if (!restoreInput)
XFixesSetWindowShapeRegion(dpy, window, ShapeInput, 0, 0, region);
else
XFixesSetWindowShapeRegion(dpy, window, ShapeInput, 0, 0, 0);
XFixesDestroyRegion(dpy, region);
}
void MCompositeScene::drawItems(QPainter *painter, int numItems, QGraphicsItem *items[], const QStyleOptionGraphicsItem options[], QWidget *widget)
{
QRegion visible(sceneRect().toRect());
QList<QGraphicsItem*> to_paint;
QList<QStyleOptionGraphicsItem> paint_opts;
// visibility is determined from top to bottom
for (int i = numItems - 1; i >= 0; --i) {
MCompositeWindow *cw = (MCompositeWindow *) items[i];
if (visible.isEmpty())
// nothing below is visible anymore
break;
// FIXME: this region is always the same as the window's shape,
// some transformations would be needed...
QRegion r(cw->sceneMatrix().map(cw->propertyCache()->shapeRegion()));
// transitioning window can be smaller than shapeRegion(), so paint
// all transitioning windows
if (cw->isWindowTransitioning() || visible.intersects(r)) {
to_paint.prepend(cw);
paint_opts.prepend(options[i]);
}
// subtract opaque regions
if (!cw->isWindowTransitioning()
&& !cw->propertyCache()->hasAlpha() && cw->opacity() == 1.0)
visible -= r;
}
// paint from bottom to top so that blending works
while (!to_paint.isEmpty()) {
// TODO: paint only the intersected region (glScissor?)
MCompositeWindow *cw = (MCompositeWindow*)to_paint.takeFirst();
painter->save();
painter->setMatrix(cw->sceneMatrix(), true);
QStyleOptionGraphicsItem opts = paint_opts.takeFirst();
cw->paint(painter, &opts, widget);
painter->restore();
}
}
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